Nowadays, the anomalous but very fascinating scattering behavior is observed by artificially designed so-called metamaterials with unconventional optical constants [1]}, [2]}. They have the ability to present unique scattering properties like optical cloaking [3]}, negative optical reflection [4]} and efficient control on scattering directionality [5]} with valuable interest in the fields of nanoantenna, nano waveguides and optical manipulations [5]}, [7]}, [8]}, [9]}.
The recent advancement in the field of metamaterials allows to achieve the invisibility of an object through scattering cancellation by manipulating the optical permittivity and permeability of the materials [3]}, [11]}. Although, it is challenging to find appropriate materials to design the metamaterial that presents a strong artificial magnetism in the visible range.
Recently, the ZBS has been shown by a sphere made of composite metamaterial [5]} by tuning the permittivity of the sphere in such a way that electric and magnetic multipoles interfere destructively in the backward direction, thus ZBS is achieved. This proposal is neither robust against the radius nor accommodates the permeability of the sphere, while the Kerker's method is applicable for all radii.
